WBC junior middleweight champion Saul Alvarez refused to respond to his Mexican rival, Julio Cesar Chavez Jr. The two superstars are going to return this Saturday in separate events in Las Vegas. Chavez took a shot at Canelo in televised interview in Mexico. He says Canelo's weekend defense with Josesito Lopez is a circus act. Chavez will face Sergio Martinez, one of the top pound-for-pound fighters in the world.